[PLUG-TALK] Fluke 87 multimeter

[Denis Heidtmann]

On Mon, May 23, 2011 at 12:07 PM, Aaron Burt <aaron at bavariati.org> wrote:

> On Fri, May 20, 2011 at 05:51:29PM -0700, Denis Heidtmann wrote:
> > 2) I see that this meter has what I judge to be a very clever
> feature--the
> > drive to the LCD can be sent to the speaker so that the readings can be
> > decoded and recorded.
>
> http://www.circuitmaestro.com/Projects/DataHolster/DataHolster.html
>
> That looks like a cool project.  I would use a TeensyDuino instead of a
> 68HC705, since they can act as USB devices, and are super-easy to program
> under Linux.  (And also because I already have a handful of Teensys, and
> could easily get more tonight at the DorkBot meeting.)
>
> I'd probably also put an optisolator on the output of of the speaker, to
> keep the Magic Smoke inside my PC.
>

I do not understand.  Are not sound waves isolation enough?


>
> Speaking of multimeter hacks, it turns out that many "no-name" multimeters
> all use the same chip, which supports serial output:
>
> http://flashingleds.wordpress.com/2010/11/30/unlocking-rs232-output-from-your-multimeter/
> <http://lists.pdxlinux.org/mailman/listinfo/plug-talk>
>

Now that is a still more practical idea.  Both (Fluke's audio output and the
taping into a feature that the manufacturer chose to hide) ideas have strong
hack appeal.  A manufacturer hiding an exploitable feature rankles.

-Denis
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